I will look around to see if I can find my paperwork for these Hot Rod Sets. If I remember correctly LD Heater was the distributor for these sets to music stores in that late '70s. I bought an old display set up that a dealer would put it on his sales counter. They were ceramic magnets that came with some sheilding, and there was also a full humbucker kit. My stuff is in a storage vault but I scanned in some of the paperwork of the important things, so I wouldn't have to run there to get reference material when needed. Once I find the disc I'll let you know.